I think the answer is:
B. Chemical Change.
Answer:
CH4+2O2-->2H2O+CO2 chemical reaction
Answer:
Following are the solution to these question:
Explanation:
Calculating the mean:


Calculating the standardn:

Please find the correct equation in the attached file.

For point a:

For point b:

For point c:

It is calculated by using the slope value that is
. The slope value
is ambiguous.